(19)
(11) EP 2 169 959 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.09.2010 Bulletin 2010/37

(43) Date of publication A2:
31.03.2010 Bulletin 2010/13

(21) Application number: 09171820.5

(22) Date of filing: 30.09.2009
(51) International Patent Classification (IPC): 
H04N 7/26(2006.01)
 H04N 7/34(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
AL BA RS

(30) Priority: 30.09.2008 JP 2008255212

(71) Applicant: YAMAHA CORPORATION
Naka-ku Hamamatsu-shi Shizuoka-ken 430-8650 (JP)

(72) Inventors:
  • Nishikawa, Yukinari
    Hamamatsu-shi, Shizuoka-ken 430-8650 (JP)
  • Honme, Mitsuhiro
    Hamamatsu-shi, Shizuoka-ken 430-8650 (JP)

(74) Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Lossless compression-encoding device


(57) In a lossiess compression-encoding device, a differential coding part calculates a prediction value of data to be compressed, and calculates a prediction error that is a difference between the prediction value and an actual value of the data to be compressed. A prediction error conversion part performs reversal of a sign bit of the prediction error output by the differential coding part in case that the reversal of the sign bit of the prediction error decreases an absolute value of the prediction error. A variable-length coding part performs variable-length coding on the prediction error that has been processed by the prediction error conversion part to generate a variable-length code representing the prediction error, and outputs the variable-length code as compressed data in such a manner that a code length of the compressed data decreases as the ablosulte value of the prediction error decreases.







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